一种h12mdi水性聚氨酯的制备和性能分析-纺织材料与纺织品设计专业论文.docx

摘要东华大学硕士论文光谱上CO和NH 吸收峰向靠近坐标轴方向移动，峰值下降。结晶熔融温度由66.9°C降低到56.08°C。表面孔洞少而深，形状变规则，边缘变锋锋利表面颗粒增多。(3)对W PU 胶膜和涂层布的通透性，透湿吸水性和力学性能测量分析表明：硬链段含量从25.27% 上升到51.25% 时，胶膜的透气率增加了36.63% ，透湿量下降了46.8% ，接触角增大，涂层布的断裂强度增加66.97% ，断裂伸长减小了47.7%。DM BA 含量从5%升高到8% ，胶膜透气率下降了64.62% ，涂层布透气率下降65.03% 。胶膜透湿量增加了将近2 倍，吸水率增加了190.2% ，接触角变小，断裂强力增加29.3% ，断裂伸长下降了60.2% 。胶膜厚度和烘燥温度也会对W PU的透气性和防水透湿性能产生一定影响。(4)对W PU 胶膜和涂层布性能对比结果表明：涂层布的孔洞在0.5-1.5um之间，胶膜微孔在l-2um 之间。涂层布的透气性比胶膜好，DMBA 含量较小时，涂层布的吸水性比胶膜好，DMBA含量过高，胶膜溶胀，吸水率变得比涂层布高。涂层的断裂强度比胶膜高出99.4% ，而断裂伸长比胶膜小90.59%。实验表明，H12MDI水性聚氨酯有良好的乳液稳定性，涂层的防水透湿性能和机械性能比较好，可以有效的减少水性聚氨酯制备过程中的环境污染，降低了成本和安全隐患，是一种环境友好型的水性聚氨酯合成革材料。关键词：H12MDI，水性聚氨酯，透湿性，吸水性，力学性能东华大学硕士论文ABSTRACTPRPARATIO NAN DPERFO RMAN CE AN A LY SIS O FH nM DIW ATERBO RNE P OLYURETH ANEA B STRA C TWaterbornepolyurethane(WPU)isdispersibleinwatermedium,whichisnon-toxic,non-flammableandenvironmentalfriendlyand hasadvantageinpriceand costcomparedwithsolventbornepolyurethane.Sopeoplearemoreinclinedtostudythedevelopmentandapplicationofwaterbornepolyurethane.ButWPUisstillhavemanydefectsinperformanceandleathersimulation.Thedomesticsyntheticleatherproductsarestillconcentratedintheproductionofsolventbornepolyurethane.Mostapplicationofwaterbornepolyurethaneisconcentratedinleatherfinishingand leatheradhesive.Asthestudyofwaterbornepolyurethanesyntheticleatherhasjuststartedinchina,ifpeoplewantW PU becomemorepracticalandsubstitutePU,thebasedworkistoimprovethepreparationandpropertiesofwaterbornepolyurethane.Toaddresstheseissues,wesynthesizedaenvironmental-friendlywaterbornepolyurethaneandanalyzedtheformingproperties.FirstwechooseHnMDIandPTMGasthemainmaterial,BDOassmallmolecularextenderandDMBAashydrophilicchain extendertosyntheticWPUemulsion.HuMDIisakindofisocyanatewhichisnotcontainbenzeneringandyellowingresistance.ComparedwithMDIfilm,HnMDIsairpermeabilityincreasedby15%，watervaporpermeabilityincreasedby17-25%,breakingstrengthincreasedby31.26%andelongationincreasedby20.4%,DMBA WPU film hadbetterwatervaporpermeabilityandmechanicalpropertiesth